Improvement in lifting-jacks



UNITED STATES PATENT OFFICE.

JAMES T. GUTHRIE, OFLEESBURG, OHIO.

` IMPROVEMENT IN LIFTING-JAGKS.

Specification forming part of Letters Patent o. 147,125", dated February 3, 1874; application led January 6, 1874.

Lifting-jacks having pivoted levers and ex-` tensible slidesvhave been used, in different comblnations, w1th supporting-standards and p other devices; and they have also been adapted for use with high and low vehicles, and in which the weight of the vehicle is made the means to maintain the lever in position when the jack is applied.

The object of my invent-ion is to render the lit'tingjaek durable in its jointed connections, and to cheapen its construction, with entire convenience and safety in applying it. rlhcsc advantages are obtained by the combination ot' angle-irons with the hand-lever, the supporting-standards, and the base, the said angleirons having branches less than a right angle, and pivoted to the base in a line, or nearly so, with the inner side of the hand-lever, and earrying the supporting-standards in their free ends with the pivots of the angle-irons and of the supporting-standard, so arranged that the depression of the lever to raise the vehicle will Y bring the branches ot' the angle-irons upward,

with their standard-pivot in advance of the base-pivot and over the lever, by reason ot' the acute angle of saidshort branches, and vthereby hold the lever down by the weight of the "chicle In the accolnpanyin g drawings, Figure l represents the lifting-jack in the position it oceupies for applying it to the axle of the vehicle; Fig. 2, a view in the position when supporting the wheel from the ground; and Fig. 3, the angle-iron with brace.

The hand-lever A has secured to its sides angle-irons B, by strong bolts passing through `thein and the end of the lever 5 and these angle-irons are secured to base O by a strong bolt, a, which forms the turning-p0int for said lever in a line with its inner side, or nearly so. The free ends D of the angle-irons project from the base-joint a at an acute angle to the lever; and they are jointed by a strong bolt, b, to the lower end of a standard, E, which is applied in a vertical position beneath the object to be raised. The turning-joints ay and If are arranged in such relation to each other and the hand-lever, that when the latter 1s depressed to raise the axle the turning-joint b of the slmperting-standard will be brought over in front of the lever-joint a by the acute angle of the branches D, and by this construction bring the weight of the object directly uponthe lever to hold it down, as shown in Fig. 2, wherein it will be seen that a vertical line drawn through the joint of the support ing-standard will bring it within-that is, to one side of-tl1e joint ofthe lever and over the lever itself, when the latter occupies a posi; tion at right angles to the supporting-standard. This standard s'provided with a series of notches, c, on its outer face,-and an exten sible standard, F, is arranged upon its inner side, and within a guide-strap, G, so as to be raised and lowered therein to suit the height ot' the axle, and held in such position by a link, ll, pivotcd to the bar F, and resting in the notches c in an oblique position, so as to hold the bar F iiri'n against the supportingstandard. This extensible slide is for use with axles that may be higher from the ground than the length of the main standard.

In applying the jack, the Alever is raised il Y a vert-ical position parallel with and against the supporting-standards, in which position 'the extensible bar will be between the lever and the jointed bar, and in this position of thev parts the acute branches of the angle-irons will bring' the supporting-standard in a vertical position, and hold the parts upright in applying the jack.

In both applying and releasing the jack, the hand-lever is brought to a vertical position, and in bringing it down the. angle-iron branches move in the are of a circle to bring the pivot ot the supportingstandard over the lever. Y

The standard or the extensible slide is adjusted beneath the axle to raise it from the ground.

The angle-irons are either made solid, as shown in Figs. l and 2, orvwith braces H, as shown in Fig. 3, to render the acute supportingbranch l) strong and durable.

I claim- The acute angle-irons B D, jointed to the base O and to the supporting-standard E, in combination with the base O, the hand-jointed lever A, the standard E, and the extensible bar F, substantially as described.

JAMES T. GUTHRIE.

Witnesses VILL. T. HOLMES, vN. S. TEMPLTN. 

